So how do you go about identifying a round the clock plumber who will be at your beck and call? The first step would be to ask for referrals from your neighbors and your friends. People will never refer someone they do not trust to do the work they say they can do as well as someone who did not perform their duties exemplary! Once you are given some names, it is now up to you to make the necessary calls and hold some form of an interview to determine whether the person is suited for the job you want them to do.
The internet has made doing business very easy. You can be able to browse a plumber in your area very easy and get their qualifications online. Some plumbers have their very own site where they explain to you what they are able to do and how they go about doing. To be on the safe side, when browsing, make sure to indicate a 24-hour plumber so that the results are what you want to see. As with the word of mouth referral, you should take steps to ensure the person is who they say they are. If they have indicated testimonial, you can do a follow up to find out exactly what made them get a good reference.
All in all, you should expect your 24-hour plumber to be able to do the most basic of plumbing services which would be fixing your drainage, sewerage or water system. They should also be able to run some form of diagnostic to ensure that what they see is actually the problem as well as be able to identify whether trouble is brewing in your system. Some plumbing work might require the use of their hands alone so you shouldnt be alarmed if your plumber does not have some form of mechanical machinery. Sometimes they will come with machines to help make the work smooth or for example identify whether there are any faults in your piping
Another way you can be able to vet a company is to ask around if the major construction players have heard about them. Plumbing and construction companies work closely together. You can ask your contractor which company is best for any issues that might arise with your plumbing. If you are lucky enough to have a contractor who has an established rapport with a plumbing company, ask them if the services offered are 24/7. Your contractor or the person who was in charge of your construction project should be in a better position to give you tips or even refer you to the plumber they used.